Get `parserServices` from `context.sourceCode` in ESLint 9

In ESLint 9, some methods and properties that used to be accessible on the context object have been moved to the SourceCode object. This includes parserServices which we are leveraging. This updates the code that uses it to get it from context.sourceCode when available.

https://eslint.org/docs/latest/use/migrate-to-9.0.0#-removed-multiple-context-methods